![background image](http://html1.mh-extra.com/html/omron/cp1l-12-2007/cp1l-12-2007_operation-manual_742083352.webp)
319
Interrupt Functions
Section 6-1
Prevention of Duplicate Processing
b.
The following example shows duplicate processing by an interrupt
task, which interrupts processing while BSET is writing to a block of
words and yields an incorrect comparison result.
Since the interrupt occurs during BSET(071) processing and before #1234 is
set in D10, the content of D0 and D10 do not match when the comparison is
made in the interrupt task (*1) and output A remains OFF.
In the end (*2), the D0 and D10 both contain #1234 and match, but the correct
comparison result is not reflected in comparison result output A.
+B
D0
#0001
D0
DI
EI
Cyclic task
Disables execution of
interrupt programs.
Enables execution of
interrupt programs.
BSET
#1234
D0
D10
CMP
D0
D10
A
1234
1234
1234
1234
1234
1234
0502
ABCD
ABCD
ABCD
1234
OFF
OFF*
1
003E 0502
D0
D1
D2
D10
A
1234*
2
OFF
Cyclic task
Interrupt task
Equals Flag
#1234 set in D0.
#1234 set in D1.
#1234 set in D2.
#1234 set in D10.
BSET(071)
processing
CMP(020)
processing
Read D0.
Read D1.
Output result.
Compare D0 and D10.
Interrupted.
Continued.
Interrupt occurs.
Interrupt completed.
Flow of Processing
Содержание CP1L - 12-2007
Страница 3: ...iv...
Страница 9: ...x...
Страница 13: ...xiv TABLE OF CONTENTS...
Страница 21: ...xxii...
Страница 33: ...xxxiv Conformance to EC Directives 6...
Страница 65: ...32 Function Blocks Section 1 5...
Страница 428: ...395 Clock Section 6 9...
Страница 429: ...396 Clock Section 6 9...
Страница 523: ...488 Troubleshooting Unit Errors Section 9 4...
Страница 531: ...496 Replacing User serviceable Parts Section 10 2...
Страница 563: ...528 Auxiliary Area Allocations by Function Appendix C...
Страница 611: ...576 Auxiliary Area Allocations by Address Appendix D...
Страница 638: ...603 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 639: ...604 Connections to Serial Communications Option Boards Appendix F...
Страница 669: ...634 Index...
Страница 671: ...636 Revision History...